The mobile robot is widely applied in various complicated terrain environments, so the requirements of travelling speed and capacity of passing complicated terrain for travelling mechanism are higher. In the paper, the interactions and problems existing between components are determined with function analysis tool as well as the key problems are determined with causal chain analysis tool in modern TRIZ (Theory of Inventive Problem Solving) theory system by taking wheeled travelling mechanism as the prototype system as well as analyzing its advantages and disadvantages. The above problems are solved and 10 conceptual proposals are obtained through combining such tools as ideal final result, cropping, substance-field model, physical and technical contradictions with inventive principles. Finally, the scheme of deformable tire is determined to be the optimal technical scheme and modeling design is carried out.